JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Just take your flip-a-gram iframe embed code and embed it to your form using the Text Tool. Text is under Form Tools.
<iframe height="640" width="540" frameborder="0" src="//flipagram.com/f/33qCkZFHMD/embed"></iframe>
With regards to your second question, can you open a separate post with this title? "How do I add Images to the Image Slider Widget?" Unfortunately, we can't handle different topics per thread and since you've posted the questions in the title, I have no way to split your thread. Thanks for your understanding.